Exit Sign with Battery Back Up, Fixture Wattage 3.80, Lamp Type LED, Letter Color Red, Background Color White, Number of Faces 2, Housing Color White, Housing Material Thermoplastic, Mounting Universal, Voltage 120/277, Depth 1-3/4 In., Height 7-1/2 In., Width 12-1/4 In., Battery Type Nickel Cadmium, Emergency Illumination Time 90 min.Directional Indicators Chevron Directional Knockouts, Letter Size 6 In. High, Optional Guard 4YFV2, Includes Push Button, 2 yr. Warranty RestrictionsHazardous Material Lithonia Lighting Exit SignsContractor Select Series3-sided housing has snap-fit components for easy installation. Push-button test11. 13M589 to 13M596 feature high-efficiency LED lamp heads and LED indicators. 16U220 and 16U221 feature a swiveling emergency light bar and rechargeable battery.All are UL Listed. Meet UL 924, NFPA 101, NFPA 70-NEC, and OSHA illumination standards.120/277V 6"H letters with 3/4" stroke; New York Approved have 8" high letters with 1" stroke Universal mounting capability Knockout chevrons for choice of direction Ni-Cd battery (unless noted)